DE19533648C2 - Pipe coupling - Google Patents

Description

The invention relates to a pipe coupling according to the Merk paint in the preamble of claim 1.

Such a pipe coupling counts through the EP 0 418 961 B1 for the prior art. The sealing element this pipe coupling consists of a ring ge curved coil spring with almost circular turns as a ring core and from an Ela surrounding the ring core stomer material together. It's in a chamber that through the tube surface, a concave curved circle annular press surface on the sleeve and one to the press surface che oppositely inclined counterpressing surface on the pressure ring is financed.

The sealing element faces due to the screws spring-formed toroid has an inner cavity. Will now by damaging the surrounding the toroid  Sealing jacket a connection between the cavity and caused by the environment, this necessarily means a leak. As a result, the sealing element loses its function.

Another peculiarity in the known case is that the chamber receiving the sealing element radially after is open on the outside. This allows the sealing element, ins especially if the material of the Dichtman becomes fatigued means and / or the toroidal core, for example due to Shocks in this radial gap with deform the consequence that this also tightness and so that the function of the sealing element is canceled.

Damage to the sealing jacket can also be caused by the Pressure ring and the sleeve are caused when the Distance between the pipe surface and the inner edges the pressing surface on the sleeve and the counter pressing surface on Pressure ring grows. This allows the inside edges in the Penetrate the material of the sealing jacket. This is being tightened Situation due to an inclination of the pressure ring.

The invention is based on the prior art Task to create a pipe coupling, which even with larger distances between the pipe surface and the inner surfaces of the sleeve as well as at inclinations the longitudinal axis of the pipe to the longitudinal axis of the sleeve one perfect chambering of the sealing element and without the Ge If the seal is damaged, the seal will last a long time elements guaranteed even with material fatigue.

According to the invention, this object is achieved in those listed in claim 1 Characteristics.  

After that, the metallic support ring is now not only in a sealing jacket made of elastic material embedded, but it also embraces a form-fitting diamond-like core ring made of elastic material. Hollow rooms with pre-programmed leaks specifically avoided. The support ring itself is light to manufacture. The strip with the transversely protruding tongues can be punched out of a board and then un ter connection of the tongue ends form-fitting around the core ring can be bent. The core ring can consist of one in itself closed elastomer ring or from one Profiled section divided and then bent into a ring. The sealing element thus formed can then be compared large tolerances between the pipe surface and the Sleeve at different angular positions of the pipe Compensate the sleeve. Nevertheless, in all relative positions a perfect seal is guaranteed.

The sealing element can also no longer fit into a gap squeeze and be damaged as the on Take chamber for the sealing element on the circumference of the tube is closed radially outwards.

It is therefore a multi-range, large-range pipe coupling created, which even with large differences in diameter seals securely. Due to the special diamond-shaped Aus formation of the core ring and the support ring can do that Extend the sealing element very much in the radial direction and move in together. Internal tests have shown that with the sealing element according to the invention by about 30% larger diameter difference can be mastered safely can than with the well-known annular sealing element is achievable.  

A preferred embodiment of the invention Basic idea is ge in the features of claim 2 see.

After that, the sealing element is mainly in a receiving chamber through the pipe surface and the sleeve is formed. Only on that of the inclined Press surface of the sleeve axially opposite counterpressure area of the pressure ring, this receiving chamber is open. she is in the installed and operating state by a the counterpressure flange of the pressure ring locked. The outer peripheral surface of the flange then lies on the cylindrical inner peripheral surface of the Sleeve, so that in this way also a perfect contact tion of the pressure ring is ensured relative to the sleeve. Tilting of the pressure ring in relation to the tube on the one hand and the sleeve on the other hand with the risk of This prevents damage to the sealing element sen.

The sealing jacket can have a trapezoidal cross section have, which largely to the cross section of the up receiving chamber is adapted. But can also be advantageous diamond-shaped cross-section. Here is the outline of the sealing jacket in the radially outer area of the trapezoidal shape adapted to the receiving chamber, while in the radially inner Area the contour of the sealing jacket of the inner con approach of the support ring. That is, the thickness of the Sealing jacket corresponds approximately to the thickness of the tongues the support ring. However, the sealing jacket has on the inner circumference an annular surface to rest on the surface of the pushing pipe.

An advantageous embodiment of the invention is in seen the features of claim 3. After that they are End of the tongues in the ring plane of the bar over each other  and put together here. The connection the tongue ends can be done in a variety of ways. It can be glued or welded will. The tongue ends are preferred by point welded together.

To ensure a better pull-out protection, according to the features of claim 4 that of the axis of the sealing element at the closest ends of the tongues provided with claws bent in the direction of the axis. These claws are only slightly radially inward in front. However, they are still in the sealing jacket beds. However, they take effect when that Sealing element is clamped in the receiving chamber. The Claws can be angled radially inwards. Before however, they are at an angle of 45 ° to the Angled tongue ends.

The effectiveness of the claws can still according to claim 5 are supported by the fact that the claws with a coarse-grained corundum are coated.

The lip-like material accumulation according to claim 6 has the advantage that when the sealing element is pressed in in the receiving chamber sealing material ver bulge can form and in this way an additional density effect.

In order to prevent the bar from being bent in the ring shape tongues lying next to each other overlap Claim 7 the tongues not only next to each other at a distance arranged, but also point one towards their free ends tapering wedge-shaped configurations tion on.  

Bending the bar as well as the one piece with it connected tongues form-fitting around the diamond-like Core ring is thereby according to the features of claim 8 relieved that the kinks of the tongues by next mutually lying recesses are specified. This Cutouts can be small, for example, through holes inner diameter and the contour of the holes corresponding recesses on the long sides of the tongues be educated. Incisions on the edge are also conceivable.

According to the features of claim 9, the bar formed from two mortise-and-tenon rings and the end faces of the tongues are mortised together, the mortise and tenon joints trapezoidal recesses on the edge and attached to it fit ledges of the lasts on the one hand and through Trapezoidal recess formed on the front of the tongues on the other hand formed and molded projections are. The mortise and tenon rings are in the Installed condition preferably on the outer circumference of the core rings, while the tapping ends of the tongues on inner circumference of the core ring are arranged.

So that the sealing element under special conditions of use against an even better pull-out protection, d. H. an inside more intensive claws conveyed to the pipe surface is, can according to the features of claim 10 inner circumference of the support ring with a claw ring radially inwardly projecting pointed pin to be in order. This claw ring is after the cage like reaching around the core ring to the support ring tet. The cones are so long that they are ultimately art of spikes from the material of the sealing jacket to the inside protrude and press into the surface of the tube can.  

A pull-out protection can also consist in that after clasping the core ring onto the one on the side the counter surface of the pipe surface facing Län sections of the tongues U- or rod-shaped claw strips be attached. The length of the claw rails can Correspond to the length of the tongue length sections. The the Steers facing pipe surface ends of these claw rails hen radially inwards over the sealing jacket, so that they also change in relative displacement of the pipe Can claw in the pipe surface. The Ab The sealing element is then supported on the counterpressure area.

The invention is based on in the drawings gene illustrated embodiments explained in more detail. Show it:

Figure 1 in vertical longitudinal section, the upper half of a pipe coupling.

Figure 2 is an enlarged partial cross-section of a sealing element of the pipe coupling of Fig. 1.

Fig. 3 shows a reduced longitudinal vertical section through the sealing element of Figure 2 along the line III-III.

Figure 4 is a plan view of two flat sections for a support ring after punching out of a board.

Fig. 5 in vertical cross section a state of deformation of the flat portions of FIG. 4;

Fig. 6 in an enlarged view a partial cross section of a sealing element for the pipe coupling development of FIG. 1 according to another embodiment and Ausfüh

Fig. 7 in plan view a flat portion for a support ring of the embodiment of Fig. 6 after punching out of a board.

1 with the pipe coupling 2 of FIG. 1, the Endab section of a pipe 3 is designated. The pipe 3 is to be connected via a sleeve 4 to a not shown object was relatively movable.

For this purpose, the sleeve 4 has at one end a Ra dial flange 5 with circumferentially evenly distributed through holes 6 . The inner diameter ID of the radial flange 5 corresponds approximately to the inner diameter ID1 of the tube 3 . The radial flange 5 is followed by a conical length section 7 , which overlaps the end edge 8 of the tube 3 . This radially outwardly extending length section 7 then merges into a length section 9 , which is also ko-nical, but which narrows radially inward. The angle of the radially outwardly increasing length section 7 with respect to the longitudinal axis 10 of the sleeve 4 is greater than the angle of the radially inwardly reducing length section 9 .

Between the longitudinal axis 10 of the sleeve 4 more abge angled longitudinal section 7 and the radial flange 5 , a plurality of axial webs 11 are drawn.

At the less angled length section 9 is a conical, radially outwardly growing length section 12 , which merges into a par allel to the longitudinal axis 10 extending length section 13 . A pressing surface 14 inclined to the longitudinal axis 10 is formed on the inside of the conical length section 12 and a cylindrical peripheral surface 15 extending parallel to the longitudinal axis 10 is formed on the inside of the horizontal length section 13 .

At the other end of the sleeve 4 there is again a radial flange 16 with through bores 17 . Axial webs 18 extend between the radial flange 16 and the horizontal longitudinal section 13 .

The pressing surface 14 forms together with the circumferential surface 15 , the pipe surface 19 and a counterpressing surface 20 that is inclined towards the pressing surface 14 on a flange 21 of a pressure ring 22, a receiving chamber 23 for a sealing element 24 or a sealing element 24 a, which will be explained in more detail below. The outer circumferential surface 25 of the flange 21 engages with sliding play in the receiving chamber 23 and lies frontally opposite the inner circumferential surface 15 .

The flange 21 provided with the counterpressing surface 20 merges via a slightly conical connecting section 26 into a radial flange 27 with through bores 28 . The entire inner bore 29 of the pressure ring 22 , starting from the sealing element 24 , is made slightly conical in diameter, increasing in size.

Between the two flanges 21 and 27 of the pressure ring 22 several axial webs 30 are seen circumferentially distributed.

The through bores 17 , 28 in the flange 16 of the sleeve 4 and in the flange 27 of the pressure ring 22 are penetrated by screw bolts 31 . On the threaded sections 32 of the bolts 31 nuts 33 are rotated.

With the aid of the screw bolts 31 and the nuts 33 , the sealing element 24 can consequently be pressed into the receiving chamber 23 .

As can be seen when viewing FIGS. 1 to 3 together, the sealing element 24 is made up of an inner core ring 34 with a diamond-like cross-section made of elastic material, a cage-like metallic support ring 35 from a core ring 34 and an outer sealing jacket 36 an elastic material together, in which the support ring 35 is vulcanized.

The sealing jacket 36 has a trapezoidal cross section adapted to the cross section of the receiving chamber 23 between the pipe surface 19 , sleeve 4 and pressure ring 22 . The circumferential longitudinal edges 37 of the sealing jacket 36 can be angular, slightly rounded or even more rounded, as can be seen from FIG. 2. On the inner circumference of the sealing jacket 36 , a circumferential groove 38 is provided in a shallow depth.

The core ring 34 can be self-contained or divided by a profile strand and bent to form a core ring 34 . The end faces of this curved core ring 34 then abut each other frontally.

To form the metallic support ring 35 (see FIGS. 4 and 5), two identical strips 39 are first punched out from a circuit board, not shown, with tongues 40 which protrude transversely therefrom and are configured in the configuration. The length of the strips 39 corresponds to the outer circumference of the later support ring 35 according to FIGS . 1 to 3.

On the long side facing away from the tongues 40 , the strips 39 are provided with trapezoidal recesses 41 and trapezoidal projections 42 adapted to these recesses 41 .

At the transition from the strips 39 to the tongues 40 , several small diameter bores 43 are provided next to one another. In the corner areas between the strips 39 and the longitudinal sides 44 of the tongues 40 , recesses 45 are arranged, the contour of which corresponds to that of the bores 43 .

In parallel to these row-shaped bores 43 , 40 further bores 46 of small diameter are arranged approximately in the middle length region of the tongues.

At the end of these holes 46 are adapted to the contour of the Boh stanchions 46 recesses 47 in the longitudinal sides 44 of the tongues 40 .

In the end region 48 of the tongues 40 there are again bores 49 of small diameter and cutouts 50 in the longitudinal sides 44 of the tongues 40 which are adapted to the bores 49 .

The end regions 48 of the tongues 40 are also alternately provided with trapezoidal recesses 51 or with these recesses 51 matched trapezoidal projections 52 .

Through the rows of holes 43 , 46 , 49 in the tongues 40 who formed the kink in connection with the recesses 45 , 47 , 50 , which allow the tongues 40 according to FIG. 5 to be bent in a V-shape relative to the strips 39 that the kinked configuration corresponds to the cross section of the diamond-like core ring 34 .

The cage-like gripping of the core ring 34 by the Lei most 39 with their associated tongues 40 can be carried out in such a way that first the projections 42 and recesses 41 on the strips 39 are tapped ver with each other. Then this assembly is bent in the manner shown in FIG. 5 around the core ring 34 , where at the end the projections 52 end of the tongues 40 in the recesses 51 end of the tongues 40 who the. The core ring 34 is then encased in a cage-like manner by the support ring 35 .

This unit can then be vulcanized into the sealing jacket 36 in the manner shown in FIGS . 1 to 3.

From Fig. 2 it can be seen in dash-dotted lines that the support ring 35 can be equipped on the inner circumference with a claw ring 53 . The preferably attached to the support ring 35 Verkrallungs ring 53 has radially inwardly projecting pointed pin 54 , the length of which is dimensioned such that they protrude like spikes over the inner surface 55 of the sealing jacket 36 .

The sealing element 24 a illustrated in FIG. 6, like the sealing element 24 of FIGS. 1 to 3, is composed of an inner core ring 34 a of diamond-like cross-section made of elastic material, and of a metallic support ring 35 a encompassing the core ring 34 a as well from an outer, dense jacket 36 a composed of an elastic material, into which the support ring 35 a is vulcanized.

The sealing jacket 36 a has radially outside the cross-sectional line QQ a to the cross-section of the receiving chamber 23 shown in FIG. 1 between the pressing surface 14 , the peripheral surface 15 and the counter-pressing surface 20 adapted trapezoidal cross-section. Radially within the cross-sectional line QQ, the sealing jacket 36 a is V-shaped. Its thickness corresponds essentially to the thickness of the tongues 40 a of the support ring 35 a, which will be explained in more detail below. On the inner circumference, the Dichtman tel 36 a has a flat annular surface 56 , which reaches ge in the installed state on the pipe surface 19 to the system. It can also be seen that a lip-like material accumulation 57 has been created by this surface 56 .

The longitudinal edges 37 a are slightly rounded. Only the longitudinal edge 58 of the material accumulation 57 is edged tet.

The core ring 34 a can be self-contained or divided by a profile strand and bent into a core ring 34 a. The end faces of this bent core ring 34 a then, as in the case of the core ring 34 , meet head-on.

In order to form the metallic support ring 35 a, as can be seen in FIG. 7, a strip 39 a is first punched out of a circuit board (not shown in more detail) with tongues 40 a wedge-shaped in the configuration. The length of the bar 39 a corresponds we sentlichen the outer circumference of the later support ring 35 a similar to the illustration of FIG. 3. The connection of the two ends 59 and 60 of the bar 39 a via a bore 61 and an elongated hole 62 with unspecified Darge put bolts.

The tongues 40 a on one side of the bar 39 a are provided on the end with claws 63 which are angled at 45 ° to the end areas 48 a of the tongues 40 a (see also FIG. 6).

At the transition from the bar 39 a to the tongues 40 a, incisions 64 are provided which start from the longitudinal sides 44 a of the tongues 40 a.

In parallel to the incisions 64 , further incisions 65 are seen approximately in the middle length region of the tongues 40 a, which also start from the longitudinal sides 44 a of the tongues 40 a.

Also in the end regions 48 a of the tongues 40 a A cuts 66 are provided, which go from the long sides 44 a.

Through the incisions 64 , 65 and 66 in the tongues 40 a kinks are formed, which allow the tongues 40 a as shown in FIG. 6 so V-shaped relative to the Lei ste 39 a that the kinked configuration of the cross section of the diamond-like Kernrings 34 a speaks ent.

The cage-like gripping of the core ring 34 a by the support ring 35 a is carried out so that the recognizable from FIG. 7 and punched from a board assembly is bent in the manner shown in FIG. 6 around the core ring 34 a, the last of which End portions 48 a of the tongues 40 a on the inner circumference of the support ring 35 a come to lie flat on one another. These end portions 48 a are then spot welded. In this way, the core ring 34 a is sheathed like a cage.

The assembly 34 a, 35 a can then be vulcanized in the manner shown in FIG. 6 in a sealing jacket 36 a.

The claws 63 in the end regions 48 a of the tongues 40 a can be coated with a coarse-grained corundum by flame spraying.

Reference list

1 end section of 3rd
2 pipe coupling
3 pipe
4 sleeve
5 radial flange from 4th
6 through holes in 5
7 length section from 4th
8 front edge of 3rd
9 length section v. 4th
10 longitudinal axis v. 4th
11 bridges between 5 and 7
12 length section from 4th
13 longitudinal section from 4th
14 pressing surface on 12
15 circumferential surface on 13
16 radial flange from 4th
17 through holes in 16
18 bridges between 13 and 16
19 pipe surface
20 counter pressing surface
21 flange of 22
22 pressure ring
23 receiving chamber
24 sealing element
24 a sealing element
25 peripheral surface v. 21
26 connecting section
27 radial flange from 22
28 through holes in 27
29 inner bore from 22
30 axial webs between 21 and 27
31 bolts
32 thread sections from 31
33 nuts on 31
34 core ring
34 a core ring
35 support ring
35 a support ring
36 sealing jacket
36 a sealing jacket
37 longitudinal edges of 36
37 a longitudinal edges from 36 a
38 circumferential groove
39 lasts
39 a bar
40 tongues
40 a tongues
41 recesses in 39
42 tabs on 39
43 holes in 40
44 long sides of 40
44 a long sides of 40 a
45 recesses
46 holes
47 recesses in 44
48 end ranges from 40
48 a end areas from 40 a
49 holes in 40
50 recesses in 44
51 recesses in 48
52 tabs
53 claw ring
54 pins on 53
55 surface inside v. 36
56 inner peripheral surface v. 36 a
57 Material accumulation
58 longitudinal edge of 57
59 end of 39 a
60 end of 39 a
61 hole in 59
62 slot in 60
63 claws
64 cuts
65 cuts
66 cuts
ID inside diameter of 5
ID1 inner diameter of 3rd
QQ cross-sectional line

Claims (10)

1. Pipe coupling, the circumferential side of a pipe ( 3 ) one the end section ( 1 ) of the pipe ( 3 ) with play over gripping sleeve ( 4 ) with a to the longitudinal axis ( 10 ) of the sleeve ( 4 ) inclined annular pressing surface ( 14 ) Sealing element ( 24 , 24 a) from a resilient metallic support ring ( 35 , 35 a) and a support ring ( 35 , 35 a) surrounding elastic sealing jacket ( 36 , 36 a) and one between the sealing element ( 24 , 24 a) itself, the sleeve ( 4 ) and the pipe surface ( 19 ) pressing, with a likewise to the longitudinal axis ( 10 ) of the sleeve ( 4 ) inclined circular counter-pressing surface ( 20 ) provided pressure ring ( 22 ), characterized in that the one in cross section diamond-shaped core ring ( 34 , 34 a) of elastic material encompassing cage-like and in the elastic sealing jacket ( 36 , 36 a) vulcanized support ring ( 35 , 35 a) an annularly curved, transversely projecting and V-shaped tongues ( 40 , 40 a ) Having bar ( 39 , 39 a), the free ends ( 48 , 48 a) of the tongues ( 40 , 40 a) are non-positively connected and the receiving chamber ( 23 ) formed in the sleeve ( 4 ) for the sealing element ( 24 , 24 a) is closed radially outwards. 2. Pipe coupling according to claim 1, characterized in that the sealing jacket ( 36 , 36 a) has a diamond-shaped or trapezoidal cross-section and is embedded in a trapezoidal-shaped receiving chamber ( 23 ), which through the pipe surface ( 19 ), the inclined pressing surface ( 14 ) of the sleeve ( 4 ), an adjoining the pressing surface ( 14 ) in the direction of the pressure ring ( 22 ) adjoining inner cylindrical peripheral surface ( 15 ) of the sleeve ( 4 ) and the surface opposed to the pressing surface ( 14 ) inclined counterpressure surface ( 20 ) is limited on the pressure ring ( 22 ), the counterpressing surface ( 20 ) forming part of a flange ( 21 ) on the pressure ring ( 22 ) which engages in the annular gap between the pipe surface ( 19 ) and the peripheral surface ( 15 ). 3. Pipe coupling according to claim 1 or 2, characterized in that the ends ( 48 a) of the tongues ( 40 a) in the ring plane of the bar ( 39 a) overlaid and connected here. 4. Pipe coupling according to one of claims 1 to 3, characterized in that the axis of the sealing element ( 24 a) are closest to the ends ( 48 a) of the tongues ( 40 a) with claws ( 63 ) bent in the direction of the axis are. 5. Pipe coupling according to claim 4, characterized in that the claws ( 63 ) are coated with a coarse-grained corundum. 6. Pipe coupling according to claim 4 or 5, characterized in that the sealing jacket ( 36 a) in the region of the claws ( 63 ) is provided with a lip-like material accumulation ( 57 ). 7. Pipe coupling according to one of claims 1 to 6, characterized in that the tongues ( 40 , 40 a) are spaced apart and have a wedge-shaped configuration narrowing towards their free ends ( 48 , 48 a). 8. Pipe coupling according to one of claims 1 to 7, characterized in that the kinks of the tongues ( 40 , 40 a) through mutually parallel recesses ( 43 , 45 ; 46 , 47 ; 49 , 50 , 64 , 65 , 66 ) are specified. 9. Pipe coupling according to claim 1, characterized in that the strip of two mortised together strips rings (39) is formed and the ends of the tongues (40) are mortised together, the Verzapfungen the inguinal rings (39) and the tongues (40) formed by trapezoidal recesses ( 41 , 51 ) on the edge or end face, as well as projections ( 42 , 52 ) adapted to the recesses ( 41 , 51 ). 10. Pipe coupling according to claim 9, characterized in that on the inner circumference of the support ring ( 35 ) a claw ring ( 53 ) is BEFE Stigt, which penetrates the sealing jacket ( 36 ) with radially inwardly directed pointed pins ( 54 ).